Small kidney of unknown cause (N27) ICD-10-CM
The N27 code range covers small kidney of unknown cause with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- oligonephronia
Codes in the N27 Range 4 codes · 3 billable
About the N27 Code Range
A contracted kidney is another term for the small-kidney finding described here when its cause is unknown.
The subdivisions distinguish one affected side, N27.0, from both sides, N27.1. N27.9 does not specify whether one or both sides are affected.
Questions About This Page
How many billable codes are in the N27 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the N27 range classify?
The range classifies small kidney of unknown cause. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
